PCAF scores every emissions figure from 1 to 5, where 1 is a verified reported number from the counterparty and 5 is an estimate derived from sector averages. A portfolio's average score tells a reviewer how much of the total rests on estimates. DitchCarbon shows which counterparty figures were disclosed, which were third-party assured and which were estimated, so the score can be evidenced line by line rather than asserted.